INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
SERVICE DE LA ROTATION TERRESTRE
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire 75014 PARIS (France)
Tel. : 33 (0) 1 40 51 22 29
FAX : 33 (0) 1 40 51 22 91
Internet : services.iers@obspm.fr
Paris, 2 February 2011
Bulletin C 41
To authorities responsible
for the measurement and
distribution of time
INFORMATION ON UTC - TAI
NO positive leap second will be introduced at the end of June 2011.
The difference between Coordinated Universal Time UTC and the
International Atomic Time TAI is :
from 2009 January 1, 0h UTC, until further notice : UTC-TAI = -34 s
Leap seconds can be introduced in UTC at the end of the months of December
or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
six months, either to announce a time step in UTC, or to confirm that there
will be no time step at the next possible date.
Daniel GAMBIS
Head
Earth Orientation Center of the IERS
Observatoire de Paris, France